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About: Zittelloceras     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : umbel-rc:Mollusk, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: ThingEukaryoteAnimalMolluscaanimaleukaryotemolluscaspeciesumbel-rc:Mollusk New Facet based on Instances of this Class

Zittelloceras is an extinct genus of nautiloids from the order Oncocerida which are among a large group of once diverse and numerous shelled cephalopods, now represented by only a handful of species. Zittleoceras, which is included in the family Oncoceratidae, is characterized by subcircular or slightly depressed cyrtoconic shells with ventral, suborthochoanitic empty siphuncles; the shell surface typically with crenulated transverse frills or distinct noncrenulated annulations. Zittleoceras has been found in middle and upper Ordovician sediments in North America and Scotland. (Sweet, 1964)